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I have an interested party planning to swing by and pick this up in a couple weeks. I will update on availability at that time. Thanks,

Note that at power on, the PIO "outputs" are programmed as inputs, and so both drive A and B LEDs should be on, and motor should be off. This condition normally lasts a few microseconds (maybe a little longer) until the ROM code initializes the PIO. Then later, once the ROM code to attempt a...

Do you get the "normal" boot sign-on message, like: KAYPRO II 64k CP/M vers 2.2 A> Are you saying that you can't type on the keyboard? or does the DIR command fail to (read the disk and) display the directory? Note, the crystal you need is 5.0688, not 5.0068. That should be a fairly common...

I have an Apple IIgs that I need to dispose of. It is missing the keyboard and mouse, so I have not powered it on. It has three harddrives (Q-drives), a 2400 baud modem, 5" floppy drive, two 3" floppy drives, dot-matrix printer, and monitor. I am not up for shipping. Direct Message me if you are...

I also saw that in the RICM documentation, but even Wang used 74181 chips - many did. The Wang 2200 CPU uses two 74181s. I'm not aware of Wang word processors that were based on the 2200 design, but the first models of the 1200 were based on the 500/600 calculator CPUs and so it is possible. A...

My first thought is the similarity to the Wang 1200, although this one looks more modern. It would be interesting to see more of the hardware to see if it is a derivative of the Wang machine. Then to see if it operated similarly, in which case Wang documentation might help. http://www.wang1200.org/

There is an SEBHC google groups list that has a lot of Heath experts on it. Some watch this forum and may chime-in. Although they may not be watching "Other".

In case it is useful to any Wang 700 restorers, I have made "the missing schematic" from the Wang 700 set: the motherboard. This contains only two pages: the chassis view diagram and the motherboard connectors. The first page (chassis view) was made with information from BlaBla1985 and other...

Yes, 1978. Sorry for the mis-info.

Assuming it is the same as timestamps on CP/M-Plus (3.0) on 8-bit platforms, the first two bytes form a 16-bit integer containing the number of days since Jan 1 1980. The next two bytes are the BCD hour and minute respectively. I would think that CCPM provides you with BDOS calls for accessing...

Looks like you have a 2/84 model, so it has a CRT controller chip that doesn't produce any video signal until the CPU runs the ROM code to initialize it. If both drive LEDs are ON, that could indicate the "system port" has invalid data, as if the software crashed after it started to initialize...

First question is whether this is a "Kaypro II" (2/83) or a model 2/84? When you say that both drives are lit up, do you mean that both "drive select" LEDs are on? Or simply that both motors are spinning? When you say the display is blank, do you mean that there is a "blank" taster scan when you...

M-80 and L-80 must be extracted from the LBR before they can be used. I thought there were tarballs of these tools out there, but can provide one if you need it. Not even ASM.COM from DRI will produce a .COM file - it creates a HEX file that you must run LOAD on to convert to COM. This is also...

So, if you are looking for something that recognizes the Zilog mnemonics, you can get Microsoft's M-80 (and L-80). As you have observed, using Digital Research's assemblers requires use of Intel mnemonics, possibly expanded by Z80.LIB to add Z-80 instructions as envisioned for Intel mnemonics...

I've also seen that same scenario. And it's also been my opinion that IBM does not really lead in technology, but to be fair I think there have been exceptions. Their BlueGene supercomputers had a moment. Their s390 mainframe seems to have a solid following. And their PowerPC processors do have...

E5 is EBCDIC for 'V' - the last value written to data sectors after/while Verifying them. If you look at the first track/sectors of a "3740 formatted floppy" you'll see other EBCDIC values and patterns, that are described by IBM to initialize the floppy for use on their equipment. I ran across...

I was in high school when I was introduced to our Honeywell 2040, early-mid 1970s. So, a "kid" by most definitions but definitely "not my dad's computer". We used to "sneak" into the computer center in the evenings, to get extra runs of our FORTRAN programs and to explore the manuals and...

CP/M is basically indifferent about the details of the console, that being contained within the BIOS created by the vendor for the platform you're running on. I'm not familiar with the M100 platform, but if it has a serial port, *AND* the vendor implemented CP/M "I/O redirection" in their BIOS...

Oh! That the lit buttons form an "H"... interesting and curious.

Also, DRI shipped a "reference implementation" (Intel MDS-80?) and created the de facto-standard 8" SD floppy format of CP/M. That format had two "reserved tracks", which is where they chose to put the OS for booting. I don't know whether the MDS-80 booted using a small bootstrap routine on the...